Stop-motion for twisting-machines.



No. 773,037. PATENTED OCT. 25, 1904:.

T. H. SMITH.

STOP MOTION FOR TWISTING MACHINES.

' APPLICATION iILED JAN 7, 1904.

N0 MODEL.

3 mnutoc UNITED STAT S Patented October 25, 1904.

PATENT OFFIC STOP-MOTION FOR TWlSTlNG-MACHINES.

SIFECIFIGATION forming part of Letters Patent No. 773,037, dated October 25, 1904;,

Application filed January 7, 1904.

To all whom it may concern/.- 315:

Be it known that I, THOMAS HENRY SMITH, a citizen of the United States, residing at Jam estown, county of Chautauqua, and State of New York, have invented a new and useful Improvement in Stop-Motions for Twisting-Ma chines, of which the following, taken in connectlonwlth the accompanying drawings, s a

' full, clear, and exactdescription.

I My invention is an improvement on my former Letters Patent, No. 549,859, dated November 12, 1895; and the object of my improvement is to readapt, cheapen, and perfect my former stop-motion device in such a manner as to give it a wider range of application, allowing of the successful use of a stiff tongue, and to give added celerity and ease to its admission and release from the twisting rolls and greater durability to the wearing parts and facility for their interchange.

1n the drawings, Figure 1 is a side elevation of the roller-stand, showing the improved stop-motion device in position on the thread with the tongue held tangential to the upper roll opposite the bite of the two rolls. Fig. 2 isa side elevation of the same with thread broken and the roll stopped by the tangential tongue. Fig. 3 is a detailview of the method of holding the tongue tangential to the upper roll; and Figs. 4 and 5 are details of the same, with the leg and tongue mad-e removable from the thin metal plate which attaches the device to the journal of the upper roll. Fig. 6 is a detail of the conformation of the removable metal tongue and different forms of crimps or offsets. Fig. 7 is a detail of the removable leg withspring top. Fig. 8 is a plan view of the blank for the sheet-metal attachment to the journal of the upper roll.

Similar numerals refer to correspondingparts in the several views. 7

The numeral 10 is the end bracket of the roller-stand, which supports the lower roll 11, revolubly mounted therein, and has suitable means for turning the same. Bracket 10 also. supports cap-bar 12, as shown, which bar is so formed as to hold the friction-roll 13 in position directly above continuous roll 11 in such a manner that roll 13 is independent and free to be revolved by frictional contact with Serial No. 188,019 (No model.)

bearing on the journal or pin of roll 13, as

shown. The lower part or tongue-holder 20 of plate 18 is givena turn 21 at a right angle to said upper part. The edge 22 (see Fig. 4)

of part 20 is turned downward, and to securev the upper end of wire 23, the wire 23' and the tongue 27 may be rigidly secured in the rolled edge 24 tangential to the upper roll and serve my purpose fairly. well if the stop in the tongue is givensuch a form as to al- Ways bring the tongue opposite the bite of the rolls. 1 usually prefer, however, to make the wire part 23 removable from the sheetmetal holder 20, since the constant Wear of the thread on eye 30 rapidly destroys this part. In consequence if, the wire leg 23 is made removable it can be renewed at small cost and with but little trouble. the front edge 24 of part 20 is given a like roll opposite curve 22. The upper end of wire 23 i'sgiven a return curve 25, as shown, which curved part 25 is made slightly broader at one end than the other in order that it may be inserted between the curved sides 22 and Accordingly 24, and the spring of the wire holds it firmly in position.

A slot 26 is cut in the front curve2 4, and a sheet-metal tongue 27 is formed with a roll at its rear end 28', so that the end 25 of wire 23 may be inserted through this rolled end 28 and hold the tongue in slot 26. the slot giving it suflicient room to pivotally adapt itself to the bite between the rolls, the lower edge of the slot forming a stop for the tongue to rest upon. Metal tongue 27 rests upon the lower edge of slot 26, so that the tongue is thereby held in such a position as to feed directly into the opening or bite of the rolls 11 and 13 and be drawn in thereby when the thread breaks.

It is desirable to regulate the length of that part of the tongue 27 which is drawn into the rolls, for a number of reasons: First, when a machine is stopped the tension of the threads slaeken and allow all of the stop-motions along the entire length of the machine to drop down somewhat and the ends of the tongues begin to feedin between the rolls. The tension on the yarn is weak, and when the machine starts again the tongues without the crimps 29 will feed in so far that the strength of the yarn is insufficient to pull them out and the whole side breaks down. Consequently a stop must be placed in the tongues, so that they cannot feed in so far that the threads cannot pull them out when the machine is started. Second,w hen a thread breaks down, as shown in Fig. 2, the shorter the tongue which effectively stops the top roll .the easier the withdrawal of said tongue and the easier it is reset. This minimum length of tongue releases easily and there is no danger that the tongue will extend through between the rolls and cut the thread. Constant wear on the edge of the tongues often makes them as sharp as knives, and unless the length is regulated they will cut the threads. Third, the hard metal of the wire leg must not be allowed to come in contact with the roll or it will cut a groove in the smooth surface of the roll and impair its use. For these reasons the tongues 27 are made of soft metal, preferably German silver or some such metal which works well with steel and does not wear the rolls. An offset or.crimp 29 is made across tongue 27 as a stop to limit the length of that part of the tongue which is drawn in between the rolls. The curve of the soft-metal offset bears against the revolving lower roll and while it regulates the length of tongue does not wear theroll. The part or holder 20 should be tangential to upper roll 13. Angle A B C (see Fig. 8) must be a right angle or greater,bringing the lowest edge of the holder closest to the roll. Offset or crimp 29 is so shaped as to make the tongue practically a continuation of the inside of holder 20, the tongue following the circle of the roll.

In operation the thread descends from the spools and passes around the rolls, as above described, passing through eye 30 on the lower end of the stop-motion device, causing the wire leg to rest on the thread as it passes to the bobbin below and holding the tongue 27 opposite the bite of the rolls. As soon as the thread breaks the wire falls and tongue 27 passes into the bite and is drawn in between the rolls as far as the stop 29, raising and instantly stopping upper roll 13 and holding the yarn until the operator can tie up the thread and release the roll. The tying and starting of the thread resets the wire in position with the tongue before the bite and the twisting goes on as before.

I claim as new- 1. A stop-motion for twisting-machines, consisting of a curved leg having the upper end pivotally mounted on the journal of the upper roll and an eye in its lower end for the thread, a soft sheet-metal tongue on said curved leg opposite the bite of the rolls, and an offset or crimp in said tongue to regulate the length of tongue engaged by the rolls.

2. A stop-motion for twisting-machines, consisting of a sheet-metal angle-piece pivotally mounted on the journal of the upper roll, a wire leg held by said pivoted anglepiece and having an eye in its lower end for the thread, a sheet-metal tongue pivotally held by said parts opposite the bite of the rolls, and an offset or stop in said tongue to engage a roll.

3. A stop-motion for twisting-machines, consisting of an angle-piece pivotally mounted on the journal of the upper roll. said angle part formed opposite the bite of the rolls and having retaining-lugs thereon, a wire leg having its upper end formed in a recurvant spring to fit said lugs, and a sheet metal tongue pivotally held by said angle parts opposite the bite of the rolls.

4. A stop-motion for twisting-machines, consisting of a flat angle-piece 18 and 20 pivotally mounted on the journal of the upper roll, retaining-lugs 22 and 241- on part 20, a wire leg 23 having a recurvant spring form 25 at one end to insert between said lugs and an eye 30 at the other end for the thread, a sheet-metal tongue 27 pivotally mounted on part 2.5, and a crimp or offset 29 in said tongue, substantially as and for the purpose specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

THOMAS HENRY SMlTl-l.

Witnesses:

CnAs. M. BROWN, S. A. BALDWIN. 

